CN111253092A - Technical method for stably reducing coal consumption of cement clinker sintering - Google Patents
Technical method for stably reducing coal consumption of cement clinker sintering Download PDFInfo
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- CN111253092A CN111253092A CN202010076533.3A CN202010076533A CN111253092A CN 111253092 A CN111253092 A CN 111253092A CN 202010076533 A CN202010076533 A CN 202010076533A CN 111253092 A CN111253092 A CN 111253092A
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- reducing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
- C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a technical method for stably reducing the coal consumption of cement clinker firing, which replaces high-silicon rock with medium-silicon rock and silica by adjusting a raw material batching scheme; blending industrial waste yellow phosphorus slag as a mineralizer; the fan configuration of the grate cooler is optimized, quenching is enhanced, and heat recovery efficiency is improved; the grate plate structure and the grate cooler control are optimized, and the heat recovery efficiency is improved; the pipe diameter of an air supply pipeline of the inflatable beam is enlarged, the air quantity is increased, and the heat recovery efficiency is improved; reducing the oxygen content at the outlet of the preheater C1 through the treatment of system air leakage; the novel flap valve is used for reducing inner air leakage, and a kiln tail sealing device is transformed into graphite sealing from cylinder sealing to reduce outer air leakage; the novel material spreading box is used for improving the dispersion degree of materials in the decomposing furnace and the preheater, so that the heat exchange efficiency is improved; optimize the position of the coal burner, use the coal burner of the new structure, raise the combustion efficiency and burn-off rate of the pulverized coal. The implementation of the invention greatly reduces the production cost of the cement clinker and obtains obvious economic benefit.
Description
Technical Field
The invention relates to the technical field of reduction of coal consumption in cement clinker sintering, in particular to a technical method for stably reducing coal consumption in cement clinker sintering.
Background
Macroscopic statistics data show that the raw coal consumption of the direct downstream four major industries of coal industry, such as thermal power, steel, building materials and chemical industry, accounts for more than 80 percent in total. The coal consumption of the building material industry accounts for about 14% of the coal consumption, the coal consumption of the cement industry accounts for about 70% of the coal consumption of the building material industry, the coal is mainly used as fuel in the production, electricity is used as power for driving, other fuels are rarely used, and the cement industry has very important strategic significance for reducing the coal consumption and saving the resource consumption in the face of non-renewable mineral resources of the coal.
At present, the standard coal consumption for clinker firing in the domestic cement industry is generally 105-115 kgce/t.cl (over 120kgce/t.cl in some enterprises), and the fuel cost accounts for 50-60% of the clinker manufacturing cost. Under the background, the reduction of clinker firing coal consumption through technical research becomes an important subject of technical attack in the cement industry, and is an important research direction for energy conservation and consumption reduction in the cement industry.
Disclosure of Invention
The invention aims to provide a technical method for stably reducing coal consumption in cement clinker sintering, which has the advantage of effectively reducing the coal consumption and solves the problem of high coal consumption in the cement clinker sintering technology.
In order to achieve the purpose, the invention provides the following technical scheme: a technical method for stably reducing the coal consumption of cement clinker firing comprises the following steps:
step S1: improving the burnability of raw materials: by adjusting the raw material proportioning scheme, medium silicalite and silica with better grindability and easy burning property are used for replacing high silicalite with poorer grindability and easy burning property; blending industrial waste yellow phosphorus slag as a mineralizer; the fly ash is used for improving the burnability of the raw material;
step S2: improve system heat recovery efficiency: the fan configuration of the grate cooler is optimized, quenching is enhanced, and heat recovery efficiency is improved; the grate plate structure and the grate cooler control are optimized, and the heat recovery efficiency is improved; the pipe diameter of an air supply pipeline of the inflatable beam is enlarged, the air quantity is increased, and the heat recovery efficiency is improved;
step S3: improve decomposing furnace combustion efficiency and heat exchange efficiency: reducing the oxygen content at the outlet of the preheater C1 through the treatment of system air leakage; the novel flap valve is used for reducing inner air leakage, and a kiln tail sealing device is transformed into graphite sealing from cylinder sealing to reduce outer air leakage; the novel material spreading box is used for improving the dispersion degree of materials in the decomposing furnace and the preheater, so that the heat exchange efficiency is improved; optimize the position of the coal burner, use the coal burner of the new structure, raise the combustion efficiency and burn-off rate of the pulverized coal.
Preferably, in step S1, an optimal batching scheme for preparing raw meal with better burnability is determined: the proportion of limestone is 77.6 percent, the proportion of medium silica is 8.2 percent, the proportion of converter slag is 3.0 percent, the proportion of yellow phosphorus slag is 3.5 percent, the proportion of fly ash is 7.7 percent, and the control of the oversize of raw material 80um is less than or equal to 18.0 percent; note: because the silica and the medium silica are easy to burn, the silica and the medium silica can be used independently or in combination in actual use.
Preferably, in the step S2, the connecting pipe diameter between the fan and the pipeline of the air inflation beam is enlarged from the original phi 108 mm to phi 168 mm, and the turbulent flow region of the air distribution box is eliminated, so as to achieve the purposes of reducing the resistance of the pipeline and increasing the air volume; the secondary air temperature is controlled at 1200 +/-25 ℃, and the tertiary air temperature is controlled at 1050 +/-20 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention greatly adjusts the raw material proportioning scheme, replaces high-silicon rock with medium-silicon rock and silica, and uses the fly ash mixed with industrial waste yellow phosphorus slag as a mineralizer, thereby obviously improving the easy combustibility of the raw material.
2. According to the invention, the research on the improvement of the heat recovery efficiency of the grate cooler system is used for determining that the temperature of the secondary air is controlled to be 1200 +/-25 ℃, the temperature of the tertiary air is controlled to be 1050 +/-20 ℃, and the heat recovery efficiency of the system is optimal.
3. The process for reducing the coal consumption of the cement clinker in the sintering process is stable and reliable, has obvious effect of reducing the coal consumption of the cement clinker in the sintering process, and can generate long-term coal saving effect.
4. The implementation of the invention greatly reduces the production cost of the cement clinker and obtains obvious economic benefit.
Drawings
FIG. 1 is a schematic view of the technological improvement of the present invention
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a technical solution for stably reducing coal consumption in cement clinker firing, which comprises: a technical method for stably reducing the coal consumption of cement clinker firing is provided, which improves the easy firing property of raw materials: by adjusting the raw material proportioning scheme, medium silicalite and silica with better grindability and easy burning property are used for replacing high silicalite with poorer grindability and easy burning property; blending industrial waste yellow phosphorus slag as a mineralizer; the fly ash is used for improving the easy-burning property of the raw material.
1) And carrying out chemical total analysis on all raw material components in the raw material ingredients. The main raw materials are as follows: limestone, high silica rock, medium silica rock, silica, yellow phosphorus slag, converter slag, fly ash and the like.
2) The design idea is as follows: the medium silica rock and silica with better combustibility are used to replace high silica rock with poor combustibility, the industrial waste yellow phosphorus slag is mixed as mineralizer, and different raw material formulas are designed to verify the combustibility of the raw material.
TABLE 2-1 chemical composition of raw Material (%)
TABLE 2-2 coal quality Industrial analysis
By adopting five raw materials, on the basis of the raw material proportioning scheme, the raw material easy-to-burn property related test with different proportions is carried out, thereby determining the raw material proportioning scheme with the best easy-to-burn property.
The easy-to-burn test data for different raw material batching schemes are as follows:
TABLE 2-3 easy-burn test for different raw meal formulations
As can be seen from tables 2-3, the f-CaO calcined at each experimental temperature is used as the judgment basis of the experimental result of easy-to-burn property (the experimental result is the average value of the error range of the two experimental results), and it can be seen that high silica rock is harder to burn than silica and medium silica rock.
The optimal burdening scheme for preparing the raw material with better burnability is determined as follows: the proportion of limestone is 77.6 percent, the proportion of medium silica is 8.2 percent, the proportion of converter slag is 3.0 percent, the proportion of yellow phosphorus slag is 3.5 percent, the proportion of fly ash is 7.7 percent, and the control of the oversize of raw material 80um is less than or equal to 18.0 percent; note: because the silica and the medium silica are easy to burn, the silica and the medium silica can be used independently or in combination in actual use.
Example 2
Referring to fig. 1, the present invention provides a technical solution for stably reducing coal consumption in cement clinker firing, which comprises: a technical method for stably reducing the coal consumption of cement clinker firing is provided, which improves the heat recovery efficiency of a system: the fan configuration of the grate cooler is optimized, quenching is enhanced, and heat recovery efficiency is improved; the grate plate structure and the grate cooler control are optimized, and the heat recovery efficiency is improved; the pipe diameter of the air supply pipeline of the inflatable beam is enlarged, the air quantity is increased, and the heat recovery efficiency is improved.
TABLE 3-1 grate cooler Fan configuration optimization
The connecting pipe diameter between the fan and the pipeline of the inflatable beam is enlarged from the original phi 108 mm to phi 168 mm, and the turbulent flow area of the air dividing box is eliminated, so that the aims of reducing the resistance of the pipeline and increasing the air quantity are fulfilled.
Example 3
Referring to fig. 1, the present invention provides a technical solution for stably reducing coal consumption in cement clinker firing, which comprises: a technical method for stably reducing the coal consumption of cement clinker firing is provided, which improves the combustion efficiency and the heat exchange efficiency of a decomposing furnace: reducing the oxygen content at the outlet of the preheater C1 through the treatment of system air leakage; the novel flap valve is used for reducing inner air leakage, and a kiln tail sealing device is transformed into graphite sealing from cylinder sealing to reduce outer air leakage; the novel material spreading box is used for improving the dispersion degree of materials in the decomposing furnace and the preheater, so that the heat exchange efficiency is improved; optimize the position of the coal burner, use the coal burner of the new structure, raise the combustion efficiency and burn-off rate of the pulverized coal.
After optimization, the secondary air temperature is stabilized at 1200 +/-25 ℃ and the tertiary air temperature is stabilized at 1050 +/-20 ℃. The secondary air temperature and the tertiary air temperature are key index parameters for reflecting the heat recovery efficiency of the system. Through the optimization and adjustment, the temperature of the secondary air and the temperature of the tertiary air are greatly increased, the coal consumption of a display system in production operation is obviously reduced, and the clinker burning coal consumption is greatly reduced under the condition of the same yield.
The optimal temperature control range for improving the heat recovery efficiency of the grate cooler system is determined by enhancing the treatment of the internal/external air leakage of the system, enhancing the operation control of the grate cooler and the experiment comparison under different temperature conditions: the secondary air temperature is controlled at 1200 +/-25 ℃, and the tertiary air temperature is controlled at 1050 +/-20 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A technical method for stably reducing the coal consumption of cement clinker firing is characterized in that: the method comprises the following steps:
step S1: improving the burnability of raw materials: by adjusting the raw material proportioning scheme, medium silicalite and silica with better grindability and easy burning property are used for replacing high silicalite with poorer grindability and easy burning property; blending industrial waste yellow phosphorus slag as a mineralizer; the fly ash is used for improving the burnability of the raw material;
step S2: improve system heat recovery efficiency: the fan configuration of the grate cooler is optimized, quenching is enhanced, and heat recovery efficiency is improved; the grate plate structure and the grate cooler control are optimized, and the heat recovery efficiency is improved; the pipe diameter of an air supply pipeline of the inflatable beam is enlarged, the air quantity is increased, and the heat recovery efficiency is improved;
step S3: improve decomposing furnace combustion efficiency and heat exchange efficiency: reducing the oxygen content at the outlet of the preheater C1 through the treatment of system air leakage; the novel flap valve is used for reducing inner air leakage, and a kiln tail sealing device is transformed into graphite sealing from cylinder sealing to reduce outer air leakage; the novel material spreading box is used for improving the dispersion degree of materials in the decomposing furnace and the preheater, so that the heat exchange efficiency is improved; optimize the position of the coal burner, use the coal burner of the new structure, raise the combustion efficiency and burn-off rate of the pulverized coal.
2. The technical method for stably reducing the coal consumption for cement clinker sintering as claimed in claim 1, wherein the technical method comprises the following steps: in step S1, the optimal recipe for preparing raw meal with better burnability is determined: the proportion of limestone is 77.6 percent, the proportion of medium silica is 8.2 percent, the proportion of converter slag is 3.0 percent, the proportion of yellow phosphorus slag is 3.5 percent, the proportion of fly ash is 7.7 percent, and the control of the oversize of raw material 80um is less than or equal to 18.0 percent; note: because the silica and the medium silica are easy to burn, the silica and the medium silica can be used independently or in combination in actual use.
3. The technical method for stably reducing the coal consumption for cement clinker sintering as claimed in claim 1, wherein the technical method comprises the following steps: in the step S2, the connecting pipe diameter between the fan and the pipeline of the inflatable beam is enlarged from the original phi 108 mm to phi 168 mm, and the turbulent flow area of the air distribution box is eliminated, so that the aims of reducing the resistance of the pipeline and increasing the air quantity are fulfilled; the secondary air temperature is controlled at 1200 +/-25 ℃, and the tertiary air temperature is controlled at 1050 +/-20 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114656175A (en) * | 2022-03-03 | 2022-06-24 | 冀东水泥(烟台)有限责任公司 | Method for improving cement adaptability |
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| CN110357461A (en) * | 2019-07-31 | 2019-10-22 | 吉林亚泰水泥有限公司 | It is a kind of using vessel slag as the G of raw material grade oil-well cement clinker and preparation method thereof |
| CN110526605A (en) * | 2019-09-19 | 2019-12-03 | 广灵金隅水泥有限公司 | The method for preparing clinker using low-grade limestone |
-
2020
- 2020-01-23 CN CN202010076533.3A patent/CN111253092A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043020A (en) * | 1988-09-23 | 1991-08-27 | Lerke Pavel P | Method for production of portland clinker |
| CN103833241A (en) * | 2014-01-13 | 2014-06-04 | 天瑞集团水泥有限公司 | Method for preparing cement clinker from converter slag |
| CN106630697A (en) * | 2016-12-14 | 2017-05-10 | 华润水泥技术研发有限公司 | Cement clinker and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114656175A (en) * | 2022-03-03 | 2022-06-24 | 冀东水泥(烟台)有限责任公司 | Method for improving cement adaptability |
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